JP2785661B2 - Engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for an engine, particularly an automobile engine, provided with a butterfly valve for controlling an inlet pipe area in an inlet pipe of an intake manifold.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show structural views in the vicinity of an intake manifold in an automobile engine. In the figure, 1 is an intake manifold, 2 is each cylinder (4 in this example).
The intake branch pipe 3 connected to the cylinder) is an inlet pipe section of the manifold.

A butterfly valve 4 for adjusting the opening degree of the inlet pipe, that is, the passage area, is provided in the inlet pipe 3 of the manifold.
Is provided. The butterfly valve 4 is rotatably supported by the supporting portion by fitting the rotating shafts 4a and 4b thereof into the supporting holes 3b of the boss portion 3a of the inlet pipe 3.

[0004] One of the rotary shafts 4b of the butterfly valve 4
Is connected to an output shaft of a valve driving actuator 5 attached to the outside of the side wall of the inlet pipe portion 3.
By rotating the butterfly valve 4 in the inlet pipe 3 by adjusting the passage area of the inlet pipe 3,
The intake silencing effect of the intake manifold 1 is adjusted.

[0005]

Since an engine for a vehicle such as an automobile is housed in a narrow hood, compactness is strongly required. In particular, since the intake manifold requires a relatively large space in terms of reducing intake resistance and reducing the noise of the intake air, it is possible to reduce the size of the intake manifold without increasing the intake resistance and reducing the noise reduction of the intake air. It is necessary to reduce the size.

In the conventional intake device shown in FIGS. 3 and 4, since the butterfly valve 4 is provided in the inlet pipe 3,
In this structure, the inlet pipe 3 must be protruded toward the opposite side of the cylinder by the installation space of the actuator 5 provided outside the butterfly valve 3 and the inlet pipe 3. This allows
The overall height H of the intake manifold 1 is increased to increase the installation space for the intake manifold 1, resulting in a structure that lacks compactness, and causes a problem that the intake resistance is not improved.

An object of the present invention is to provide a compact and compact intake device for a vehicle engine, which suppresses an increase in intake resistance and reduces the overall height of an intake manifold while maintaining an intake silencing effect.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention projects an inlet pipe portion of an intake manifold into a manifold, and changes a surface of the projecting portion facing the intake outlet side. A drive device (actuator) that is cut off so as to have a cut surface substantially parallel to the rotary shaft of the butterfly valve to form a cut portion, and the rotary shaft of the butterfly valve is passed through the inside of the manifold and provided on the outer side of the manifold. It is characterized by being connected to.

[0009]

Since the butterfly valve is attached to the inlet pipe projecting into the manifold, the butterfly valve is located inside the manifold as compared with the conventional one.
The height of the manifold is reduced, and the size and size of the manifold can be reduced.

On the other hand, the projecting portion of the inlet pipe in the manifold forms a cut portion in the downstream direction of the intake air, so that the passage area of this portion is sufficiently ensured and the flow of the intake air is made smooth. As a result, there is no increase in intake resistance, and there is no reduction in the intake air silencing effect in the intake manifold.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. It's just

In FIG. 1, reference numeral 1 denotes an intake manifold, 21 denotes a chamber portion of the manifold, 22 denotes a branch portion connected to each cylinder (four cylinders in this embodiment). Is being worn.

An inlet pipe 23 for intake air is provided substantially at the center of the chamber 21 in the longitudinal direction. As shown in FIG. 2, the inlet pipe 23 has a protruding portion 23a that protrudes into the chamber portion 21 of the intake manifold.

A butterfly valve 4 is provided inside the projection 23a of the inlet pipe 23. The butterfly valve 4
As shown in FIG. 1, the rotary support shaft 24 is rotatably supported by the intake manifold 1 by fitting the rotary support shaft 24 into support holes 23b and 23c provided in the boss portion of the inlet pipe portion 23. .

As shown in FIG. 1, a rotary support shaft 24 of the butterfly valve 4 extends through the inside of the chamber 21 of the manifold 1 to a side wall 21e, further extends through the side wall 21e, and The actuator 21 is connected to the actuator 5 mounted on the outside of the actuator 21e.

As shown in FIG. 2, the projecting portion 23a of the inlet pipe portion 23 of the manifold has a portion on the downstream side of the intake air flow, that is, a portion on the outlet 21f side of the intake air from the chamber portion 21. 24 are cut off so as to form a cut surface in a direction substantially parallel to the axis of 24, thereby forming a cut portion 23i.

As a result, the chamber portion 21 has sufficiently large volumes 21g and 21h on both sides of the inlet pipe portion 23 in the longitudinal direction of the intake manifold, so that the intake passage area increases and the volume for noise reduction also increases. I do.

In the automobile engine constructed as described above, the intake air flows from the inlet pipe 23 to the intake manifold 1.
After being stored and silenced here, it enters the branch portion 22 through the outlet 21f, and opens the intake valve (not shown) together with the branch portion 2.
2 at a high speed and is guided to each cylinder.

The butterfly valve 4 is rotated by an actuator 5 controlled by a control device (not shown).
To adjust the passage area of the inlet pipe 3. The intake air flows into the chamber section 21 through the passage in the inlet pipe section 3 whose area is adjusted by the butterfly valve 4, and at this time, the cut section 23 is formed at the outlet of the inlet pipe section 3.
Since i is provided, the passage area of the intake air is sufficiently large, and the intake air flows into the chamber portion 21 smoothly.

Since large volumes 21g and 21h can be formed on both longitudinal sides of the inlet tube 3 of the chamber 21,
A large noise reduction effect is obtained by the volume of this part,
The passage area of the intake flow is also enlarged.

[0021]

As described above, according to the present invention, the butterfly valve is provided in the inlet pipe projecting into the intake manifold, and the rotary support shaft of the butterfly valve is passed through the manifold to the outside of the manifold side wall. Since it is connected to the installed driving device, the height of the intake manifold is reduced as compared with the conventional one, and the manifold can be made smaller and more compact.

Further, since the cut portion is provided in the flow direction of the intake at the projection of the inlet pipe in the intake manifold, the passage area of the intake is sufficiently ensured, and the increase in the resistance of the intake passage is suppressed. Since a large volume is formed on both sides of the device, a sufficient noise reduction effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a structural diagram of an intake device for an automobile engine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, according to the embodiment of the present invention.

FIG. 3 is an external structural view showing an example of a conventional intake manifold.

FIG. 4 is a sectional view showing a structure of a mounting portion of a butterfly valve according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake manifold 4 Butterfly valve 5 Actuator 21 Chamber part 22 Branch part 23 Inlet pipe part 23a Projection part 23i Cut part 24 Rotation support shaft

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichi Amimoto 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Inventor Souhei Takahashi 10 Okuracho, Nakahara-ku, Kawasaki City, Kanagawa Prefecture (56) References JP-A-7-42626 (JP, A) JP-A 61-9525 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , (DB name) F02M 35/12 F02M 35/104

Claims (1)

(57) [Claims] 1. An intake system for an engine provided with a butterfly valve for controlling a passage area of an intake inlet of an intake manifold, wherein an inlet pipe of the intake manifold is protruded into a manifold, and the protruding portion is provided with the butterfly valve. A support portion for supporting the rotating shaft is provided, and a portion of the protruding portion facing the intake outlet side of the intake manifold,
A drive in which the rotary support shaft is cut off so as to have a cut surface in a direction substantially parallel to the axis of the rotary support shaft to form a cut portion, and the rotary support shaft is penetrated through the intake manifold, and is mounted outside the manifold side wall. An intake device for an engine, which is connected to the device.